#include"Mystdio.h"
#include<unistd.h>
#include<stdio.h>
#define myfile "test.txt"
int main()
{
    _FILE*fp=_fopen(myfile,"a");
    if(fp==NULL) return 1;
    const char*msg="hello world\n";
    int cnt=10;
    while(cnt--)
    {
        _fwrite(fp,msg,strlen(msg));
        sleep(1);
    }
    sleep(5);
    _fclose(fp);
    return 0;
}
